Command queuing apparatus and method of optical disk data reprod

Electrical computers and digital data processing systems: input/ – Input/output data processing – Input/output data buffering

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709102, G06F 1300

Patent

active

060887427

ABSTRACT:
A method and apparatus are provided to buffer commands sent from a computer to a peripheral device such as an optical disk data reproduction system, e.g., a CD-ROM drive, so that, even when execution of a command by a microcontroller of the peripheral device is not completed, additional commands from the computer can be queued. The apparatus includes: (1) an intention data detection unit for detecting intention data expressing that a packet command is to be sent from a computer and for outputting the detected result; (2) a command storage unit for buffering the packet command in response to a write signal and for outputting a buffered packet command, in response to a read signal, to a microcontroller of the optical disk data reproduction system, which processes the packet command; (3) a wait state control unit for outputting the write signal in response to the detected result and a command write signal indicating that the computer has sent the packet command, and for outputting a read signal in response to a command read signal which is generated by the microcontroller and instructs the packet command to be transferred; and (4) a command presence detection unit for determining whether an additional packet command can be buffered in the command storage unit. The performance of the entire computer system is improved, since a packet command can be sent from the computer to the optical disk data reproduction system even when execution of a previously sent command is not completed, as long as an empty buffer is available in the command storage unit.

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